Five of the top-10 most valued firms together added Rs 43,689.89 crore in market valuation last week, with ITC and Infosys contributing most to the overall gain. Gainers from the top-10 list are ITC, HDFC, Infosys, SBI and ICICI Bank; while Reliance Industries Ltd (RIL), TCS, HDFC Bank, HUL and Kotak Mahindra Bank suffered losses in their market capitalisation (m-cap) for the week ended Friday.